CN109062484B - Manual mask image acquisition method for interactive classroom teaching system - Google Patents
Manual mask image acquisition method for interactive classroom teaching system Download PDFInfo
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- CN109062484B CN109062484B CN201810852767.5A CN201810852767A CN109062484B CN 109062484 B CN109062484 B CN 109062484B CN 201810852767 A CN201810852767 A CN 201810852767A CN 109062484 B CN109062484 B CN 109062484B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/048—Interaction techniques based on graphical user interfaces [GUI]
- G06F3/0484—Interaction techniques based on graphical user interfaces [GUI] for the control of specific functions or operations, e.g. selecting or manipulating an object, an image or a displayed text element, setting a parameter value or selecting a range
- G06F3/04845—Interaction techniques based on graphical user interfaces [GUI] for the control of specific functions or operations, e.g. selecting or manipulating an object, an image or a displayed text element, setting a parameter value or selecting a range for image manipulation, e.g. dragging, rotation, expansion or change of colour
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/048—Interaction techniques based on graphical user interfaces [GUI]
- G06F3/0484—Interaction techniques based on graphical user interfaces [GUI] for the control of specific functions or operations, e.g. selecting or manipulating an object, an image or a displayed text element, setting a parameter value or selecting a range
- G06F3/0486—Drag-and-drop
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/048—Interaction techniques based on graphical user interfaces [GUI]
- G06F3/0487—Interaction techniques based on graphical user interfaces [GUI] using specific features provided by the input device, e.g. functions controlled by the rotation of a mouse with dual sensing arrangements, or of the nature of the input device, e.g. tap gestures based on pressure sensed by a digitiser
Abstract
The invention discloses a manual mask image acquisition method for an interactive classroom teaching system, and relates to the field of image processing. The invention comprises the following steps: acquiring a block diagram outside a projection area; step two, acquiring coordinates of four corner points of the external block diagram of the projection area: sequentially clicking four corner points of the outer frame diagram by a mouse to acquire a screen coordinate when the mouse clicks; step three, extending coordinates of four corner points of the outer frame of the projection area: adjusting four-point coordinates of the manually acquired outer frame image until a polygon formed by four corner points of the manually acquired outer frame image is close to the outer frame image; step four, obtaining a manual mask image: and sequentially storing the coordinates of the four corners of the external frame image in the set to form a connected domain, and drawing the new connected domain set in an image with the same resolution as that of the camera to obtain a manual mask image. The invention provides a method for manually acquiring a mask image, which can effectively remove an interference area of a projector and improve the teaching quality of an interactive classroom.
Description
Technical Field
The invention belongs to the field of image processing, and particularly relates to a manual mask image acquisition method for an interactive classroom teaching system.
Background
The interactive classroom teaching system is a system which is matched with equipment such as a projector, a computer, a camera and the like and can realize the functions of random finger touch control, interactive question answering, remote communication and the like on any smooth projection surface.
The interaction in the interactive classroom teaching system is realized by capturing images through a camera and processing the images through an image algorithm. Because the camera has a large visual field coverage surface which is larger than the projection surface of the projector, interference areas except the projection surface in the image are not required to be processed during image algorithm processing, and if the interference areas are not eliminated, the interaction in the interactive classroom teaching system is greatly influenced.
Therefore, a method for eliminating the interference area is urgently needed, and the mask image can be rapidly acquired.
Disclosure of Invention
The invention aims to provide a manual mask image acquisition method of an interactive classroom teaching system, which is characterized in that a projection image of a projector is captured by a camera and displayed on a computer screen image, a mouse is utilized to click an outer frame image of the computer screen to acquire coordinates of four corners, the coordinates are adjusted until the outer frame image is close to a real outer frame image, and then a connected domain formed by the adjusted coordinates is drawn in an image with the same resolution as that of the camera to obtain the manual mask image, so that the problems that the conventional interactive teaching system is easily disturbed by an unexpected region of a projection surface and the teaching quality is influenced are solved.
In order to solve the technical problems, the invention is realized by the following technical scheme:
the invention discloses a manual mask image acquisition method of an interactive classroom teaching system, which comprises the following steps:
step one, acquiring a projection region outer frame diagram: the image captured by the camera is put on a computer screen;
step two, acquiring coordinates of four corner points of the external block diagram of the projection area: sequentially clicking four corner points of the outer frame diagram by a mouse to acquire a screen coordinate when the mouse clicks;
step three, extending coordinates of four corner points of the outer frame of the projection area: adjusting four-point coordinates of the manually acquired outer frame image until a polygon formed by four corner points of the manually acquired outer frame image is close to the outer frame image;
step four, obtaining a manual mask image: and sequentially storing the coordinates of the four corners of the external frame image in the set to form a connected domain, and drawing the new connected domain set in an image with the same resolution as that of the camera to obtain a manual mask image.
Preferably, in the first step, the specific step of acquiring the block diagram outside the projection region is as follows:
step 1: putting a rectangular frame on a computer screen in a full screen mode;
step 2: capturing a projection image of the projector at the moment in the visible light mode by using a camera;
and 3, step 3: and throwing the captured image to a computer screen.
Preferably, in the second step, the four corner points of the outer frame map include: the outer frame diagram comprises an upper left corner point, an upper right corner point, a lower right corner point and a lower left corner point.
Preferably, in the third step, the four-point coordinates of the outer frame map are adjusted by manually adding or subtracting horizontal and vertical coordinates of the four-point coordinates until a polygon formed by the manually acquired four-corner points of the outer frame map is close to the outer frame map.
The invention has the following beneficial effects:
the invention captures the projection image of the projector through the camera and displays the projection image on the image of the computer screen, clicks the outer frame diagram of the computer screen by using the mouse to obtain the coordinates of four corners, adjusts the coordinates until the outer frame diagram is similar to the real outer frame diagram, and then draws the communication domain newly formed by the adjusted coordinates in the image with the same resolution as the camera to obtain the manual mask diagram, thereby removing the interference area of the projector and improving the teaching quality.
Of course, it is not necessary for any product in which the invention is practiced to achieve all of the above-described advantages at the same time.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a step diagram of a manual mask diagram acquisition method of an interactive classroom teaching system according to the present invention;
FIG. 2 is a schematic view of an improved front projection screen showing a projection surface;
FIG. 3 is a schematic diagram of a computer screen displaying a white frame on a full screen;
FIG. 4 is a schematic diagram of a camera capturing a projector projected image in the state of FIG. 3;
FIG. 5 is a schematic diagram of the camera of FIG. 4 capturing an image projected onto a computer screen;
FIG. 6 is a schematic view of the projection screen of FIG. 5 showing the projection of an image from the computer screen;
FIG. 7 is a schematic view of the computer screen after the four-point coordinate adjustment of the outer frame diagram in FIG. 5;
FIG. 8 is a schematic view of the computer screen of FIG. 7 with an image projected onto a projection screen;
FIG. 9 is a schematic diagram of a structure for obtaining a manual mask map;
in the drawings, the components represented by the respective reference numerals are listed below:
1-projection screen, 2-interference area, 3-white frame, 4-projection area, 5-computer screen, 6-camera screen.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the present invention is a manual mask diagram obtaining method for an interactive classroom teaching system, including the following steps:
step one, as shown in fig. 3-5, obtaining a block diagram outside a projection area: the image captured by the camera is put on a computer screen;
step two, as shown in fig. 6, obtaining coordinates of four corner points of the outer frame of the projection area: sequentially clicking four corner points of the outer frame diagram by a mouse to acquire a screen coordinate when the mouse clicks;
step three, as shown in fig. 7-8, coordinates of four corner points of the block diagram outside the outward expansion projection area: adjusting four-point coordinates of the manually acquired outer frame image until a polygon formed by four corner points of the manually acquired outer frame image is close to the outer frame image;
step four, as shown in fig. 9, a manual mask map is obtained: and sequentially storing the four-corner coordinates of the externally expanded outer frame graph in a set mask Contour to form a connected domain mask Contour, and drawing the new connected domain mask Contour set in a black image with the same resolution as the camera by using a white painting brush to obtain a manual mask graph.
Referring to fig. 2, in general, the "interaction" in the interactive classroom teaching system is realized by capturing images through a camera and processing the images through an image algorithm; since the area covered by the camera view field is larger than the projection area 4 of the projector, the interference area 2 outside the white frame 3 has no practical effect, and therefore, the area of the interference area 2 on the projection screen 1 needs to be reduced as much as possible;
in the first step, the specific steps of obtaining the outside block diagram of the projection area are as follows:
step 1: as shown in fig. 3, a rectangular white frame is dropped on the computer screen in a full screen;
step 2: as shown in fig. 4, the projection image of the projector at this time is captured with the camera in the visible light mode;
and step 3: as shown in fig. 5, the captured image is projected onto a computer screen.
In the second step, the four corners of the outer frame diagram include: the outer frame diagram comprises an upper left corner point, an upper right corner point, a lower right corner point and a lower left corner point.
In the third step, the four-point coordinates of the outer frame image are adjusted by manually adding or subtracting the horizontal coordinates and the vertical coordinates of the four-point coordinates until the manually acquired polygon formed by the four corner points of the outer frame image is close to the outer frame image; coordinates of four corner points of the outer frame diagram are obtained by clicking an upper left corner point, an upper right corner point, a lower right corner point and a lower left corner point of the outer frame diagram by a mouse; according to a large number of experiments, the specific scheme of adding and subtracting the horizontal coordinate and the vertical coordinate of the four-point coordinate is as follows: the left upper corner point of the outer frame, the X horizontal coordinate is subtracted by 3, and the Y vertical coordinate is subtracted by 3; adding 3 to the X-axis and subtracting 3 from the Y-axis of the right upper corner point of the outer frame; adding 6 to the X horizontal coordinate and 6 to the Y vertical coordinate of the right lower corner point of the outer frame; the left lower corner of the outer frame, the X horizontal coordinate is subtracted by 6, and the Y vertical coordinate is added by 6;
one specific application of this embodiment is:
the operation method of the manual mask is as follows:
1. double-clicking a left mouse button on 4 vertexes of the white outer frame in sequence according to the left upper angular point, the right lower angular point and the left lower angular point to generate 4 green calibration points;
2. no double click in order and at the outer box vertex will generate a calibration point;
3. the generated index point can be dragged by clicking a left mouse button to realize adjustment;
4. the adjustment range can only be around the calibration point, and the adjustment range is beyond the calibration point and is regarded as invalid;
5. clicking the right mouse button to push out the manual mask, wherein the operation of the 4 calibration points fails, and otherwise, the operation is successful.
It should be noted that, in the above system embodiment, each included unit is only divided according to functional logic, but is not limited to the above division as long as the corresponding function can be implemented; in addition, specific names of the functional units are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present invention.
In addition, it is understood by those skilled in the art that all or part of the steps in the method for implementing the embodiments described above may be implemented by a program instructing associated hardware, and the corresponding program may be stored in a computer-readable storage medium.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (4)
1. A manual mask image acquisition method of an interactive classroom teaching system is characterized by comprising the following steps:
step one, acquiring a projection region outer frame diagram: the image captured by the camera is put on a computer screen;
step two, acquiring coordinates of four corner points of the external block diagram of the projection area: sequentially clicking four corner points of the outer frame diagram by a mouse to acquire a screen coordinate when the mouse clicks;
step three, extending coordinates of four corner points of the outer frame of the projection area: adjusting four-point coordinates of the manually acquired outer frame image until a polygon formed by four corner points of the manually acquired outer frame image is close to the outer frame image;
step four, obtaining a manual mask image: sequentially storing coordinates of four corners of the externally expanded outline drawing in a set to form a connected domain, and drawing a new connected domain set in an image with the same resolution as that of the camera to obtain a manual mask drawing;
in the second step, the left mouse button is double-clicked on 4 vertexes of the white frame in sequence by the mouse according to the upper left corner point, the upper right corner point, the lower right corner point and the lower left corner point to generate 4 green calibration points; if the mouse is not in order and double-clicking on the white border vertices will not be able to generate the index points.
2. The method for acquiring the manual mask map of the interactive classroom teaching system as claimed in claim 1, wherein in the step one, the specific step of acquiring the outside block map of the projection area is as follows:
step 1: putting a rectangular frame on a computer screen in a full screen mode;
step 2: capturing a projection image of the projector at the moment in the visible light mode by using a camera;
and step 3: and throwing the captured image to a computer screen.
3. The method as claimed in claim 1, wherein in the second step, the four corner points of the outline border comprises: the outer frame diagram comprises an upper left corner point, an upper right corner point, a lower right corner point and a lower left corner point.
4. The method as claimed in claim 1, wherein in the third step, the four-point coordinate adjustment of the outer frame image is performed by manually adding or subtracting horizontal and vertical coordinates of the four-point coordinates until a polygon formed by the four-point points of the manually obtained outer frame image is similar to the outer frame image.
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| US9857888B2 (en) * | 2015-03-17 | 2018-01-02 | Behr Process Corporation | Paint your place application for optimizing digital painting of an image |
| CN105894470A (en) * | 2016-03-31 | 2016-08-24 | 北京奇艺世纪科技有限公司 | Image processing method and device |
| CN106507077B (en) * | 2016-11-28 | 2018-07-24 | 江苏鸿信系统集成有限公司 | Preventing collision method is corrected and blocked to projecting apparatus picture based on image analysis |
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| CN108269288B (en) * | 2017-12-28 | 2020-07-24 | 中国科学院自动化研究所 | Intelligent special-shaped projection non-contact interaction system and method |
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